CoUninitialize function (combaseapi.h)

Closes the COM library on the current thread, unloads all DLLs loaded by the thread, frees any other resources that the thread maintains, and forces all RPC connections on the thread to close.


void CoUninitialize();

Return value



A thread must call CoUninitialize once for each successful call it has made to the CoInitialize or CoInitializeEx function, including any call that returns S_FALSE. Only the CoUninitialize call corresponding to the CoInitialize or CoInitializeEx call that initialized the library can close it.

Calls to OleInitialize must be balanced by calls to OleUninitialize. The OleUninitialize function calls CoUninitialize internally, so applications that call OleUninitialize do not also need to call CoUninitialize.

CoUninitialize should be called on application shutdown, as the last call made to the COM library after the application hides its main windows and falls through its main message loop. If there are open conversations remaining, CoUninitialize starts a modal message loop and dispatches any pending messages from the containers or server for this COM application. By dispatching the messages, CoUninitialize ensures that the application does not quit before receiving all of its pending messages. Non-COM messages are discarded.

Because there is no way to control the order in which in-process servers are loaded or unloaded, do not call CoInitialize, CoInitializeEx, or CoUninitialize from the DllMain function.


Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps | UWP apps]
Minimum supported server Windows 2000 Server [desktop apps | UWP apps]
Target Platform Windows
Header combaseapi.h (include Objbase.h)
Library Ole32.lib
DLL Ole32.dll

See also